Abstract
The sideband current harmonics, as parasitic characteristics in permanent-magnet synchronous machine (PMSM) drives with space vector pulsewidth modulation technique, will increase the corresponding electromagnetic loss, torque ripple, vibration, and acoustic noises. Therefore, fast yet accurate evaluation of the resultant sideband current harmonic components is of particular importance during the design stage of the drive system. However, the inevitable magnetic saturation and cross-coupling effects in interior PMSM drives would have a significant impact on the current components, while the existing analytical sideband current harmonic model neglects those effects. This paper introduces a significant improvement on the analytical model by taking into account these effects with corresponding nonlinear factors. Experimental results are carried out to underpin the accuracy improvements of the predictions from the proposed model over the existing analytical one. The proposed model can offer a very detailed and insightful revelation of impacts of the magnetic saturation and cross-coupling effects on the corresponding sideband current harmonics.
Highlights
N OWADAYS, the immense advancements of high-strength permanent magnet (PM) material, high-efficiency power electronic device, and high-performance digital signal processor, have been contributing in building up the momentum of developing exquisite variable-frequency permanent magnet synchronous machine (PMSM) drives for various existing and emerging applications [1]–[3]
This paper proposes an improved sideband current harmonic model by incorporating the nonlinear factors so that the magnetic saturation and cross-coupling effects in interior PMSMs are taken into considerations
By taking into account the magnetic saturation and crosscoupling effects, an improved analytical model for sideband current harmonic components in interior PMSM powered by two-level voltage source inverter (VSI) with regular sampled space vector pulsewidth modulation (SVPWM) technique has been proposed and developed in this paper
Summary
N OWADAYS, the immense advancements of high-strength permanent magnet (PM) material, high-efficiency power electronic device, and high-performance digital signal processor, have been contributing in building up the momentum of developing exquisite variable-frequency permanent magnet synchronous machine (PMSM) drives for various existing and emerging applications [1]–[3]. Not until quite recently have there been particular investigations on full direct analytical developments of sideband voltage and current harmonic components in the induction machine [24] and PMSM [25] drive systems with SVPWM technique. These analytical derivations of the sideband current harmonic components are all based on the assumption of no magnetic saturation in the corresponding electric machines. Those major sideband voltage harmonic components can be promptly evaluated by using the direct current bus voltage and corresponding SVPWM modulation ratio
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